Spark-plug for explosive-engines.



M. T. MINoGr-m. erm PLUG FOB EXPLOSIVE ENGINES.

nr'nxon'rox msn 1520.115, 190s. I r

Patelltd 25, 1910.

.1'5 structthespark plfughthat the porcelain in- Sure screwfadapt to a nut 9 at the upper UNITED STATES PATENT oEEioE.

MARTIN T. MINOGUE, .DFV-PHILADELPHIA,- PENNSYLVA'NIA, ASSIGNOL BY DIRECT AND MESNE ASSIGNMENTS, T THE SUPERIOR' MOTOR SPECIALTY COMPANY, 0l' NEW YORK, N. Y., A CORPORATION OF NE'W-YOBK.

sraizxLrLU'e ron ExrLosrvrsENorNEs.

973,8'7'3gspeemuonoflaecersrmnf. Patentedoct. 25,1910.

Application nled December 18,: 1909. serial No. 533,957.

To allyfhom it may concern: e shoulder 2 .in said socket This flangealso Bfe 1t known that 1', Mairrm T. Mnvods, supports another and similar packin ring 55 a citizen of the United States, residing in 6 upon which bears the lower end of t e 11p- Philadel hia, l'ennsylvania have invented per section -1 of thel porcelain insulatin certainf rovements in park-Plu s 'for member, the latter l1 centrall recesse -Explosivengines,xof -which the fol owing t o receive the upper of the ower secis .alspecilicatiom tion 3, and the latter' being also recessed, by 6o My invention relates mainly to duplex or preference, so as to provide a considerable multip e-spark plugs for use in connection Space between the upper' and lower sections, i0 with engines of the explosive type, although as shown in Fig. 1.

some o the features of my 'invention can The liange 3 is pressed rmly upon the be used inuconnection with single spark ring 5 and? the lower end of the upper sec- 65' plugs. tion 4 of the insulatin Vinember is pressed One object of my invention is to .so confirmly up'on the rin '6 y means of a pressulating member. e same can be molded end of a yoke 410', which has a forked lower Without diiicul and the-'electrodes can be end 11 fitting in'an external groove -12 70 readily combine therewith, a further object -formed in the head ofthe plug 1, as shown bein to prevent fracture of the porcelainl 1n Fig. 2. By this means joints are formed manier' 0f the plug because of uneven exbetveen'the tw sections of the insulating pansion and contraction of'thesam'e, and-a `member and lbetween the lower section of Still further object being to providemeans the. saine and the shoulder in the socket, 75 whereby` n n externa] sparkggp can be' provWhich Joints areploof against the escape 0f; dcedm order to test Vthe sparking capacigasv under pressure. ties ofthe plug without-removin the same The two electrodes with whiclrthe plug is from the'en e. These objects attain in equipped are shown, respectively, at 13 and the manner ereinater set. forth, reference 14, -each of these electrodes being passedv `8o bein had to'the accompanyingdrawing, in through a vertical o ening in the lower ivhi'4 V A v Section .3 of the porce ain insulating niem- Figure 1 -is a view, ps1-rtl.)7 in elevation her of the plug, which opening is enlarged and partl in transverse vertical section, of' in diameter at or near its' .lower end for the A a spark p ug constructed in'a'ccordance with reception of a head 15vupo`n the electrode, 85' my-linvention; Fi 2 is a side elevation of asbestos or other-packing rinv's 16 bein inthe plug with the inding mit removed-from serted between these hea s and the shou ders 85 'the electrode; Fig. 3 is a similar view illus 1n the Sectln 33 S0. as to prevent any leak tratinganotherfeature of my invention and age of gas around the electrodes. From the Fig, 4- 1s an endvew looking in the direcheads 15 of the electrodes project the plati- 90 tion o f the arrow, w, Fig. 3. f num terminals 17, 'the sparks being formed Inthe lr .wi ng,l 11 represents the threaded between these'terniinals and the inner wall 4o metalplug which is-screwed'into the hand or 0f an mwardlv projectingfinnge 19 at the v otherl ortin' of the `cylinder of the engine lower end of the socket 1.

and is ored out to form 'al socket for the re- The upper section fl ,of the insulating 95 ce tion of the porcelain insulatin member member. of` the plug has, at 4cach side, an inofptheplug", said socket being en ar ed in cliued lug 20, these lu s being perforated, diameter at 'its outer end so as to orm a for the reception oft e' outwardly bent shoulder 2 s ome distance below the outer upper-portions ofthe electrodes13and-.14 end of the socket. A anclsaid perforations'being, by preference, 100, The porcelain insulating member comflared at their inner end's,as shown at 21, prises the 'lower section 3 vand the upper sec` so that the upper ends of the electrodes can tion-.4., said lower sectionhavinga flange 3" hc readily passed through thc openings 1u which fits the enlarged upper portion of the assembling the parts of the plug, the cham- ,4

socket andbearsu' on a ackmg ring ,5 of bei' formed between the two'sections of .the ms g copper or other so nieta resting upon the insulating member of the plugI providing j comes defective for any reason.

22 between which and the upper end of the4 lug 20 is interposed a packin .washer 23,

the threaded end of the electro e beyond the nut 22 for the reception of the binding nut 24 between which and the nut 22 theconducting wire is confined.

.YVl'ien fresh sparking surfaces are desired kthe yoke 10 and the insulating member o the plug can be turned part way around in the socket 1 s o as to bring the terminals 17 opposite another-portion of the inner face of the ange 19. o

By'the use of the two electrodes eithera battery or a ma neto current can be employed as desire or one electrode can be .quickly brought into service if the other be- A When the porcelain insulating member of the plug is made in 'two sections, as shown and described, each section can be readily molded, as the necessary 4openin s therein are straight and can bei-formed y removable plungers or cores, and the application of the electrodes is facilitated, the straight electrodes being rst passed thron h the openings in the lower section 3 an then bent outwardly for application to the inclined openings in the upper section 4. The sectional construction of the porcelain insulating member o f the plug, moreover, lessens the tendency to fracture to'which a single porcelain member is subject because of the unequal'expansionand contraction of the same due to the different degrees of heat to which its upper and lower portions are subjected.

It is frequently advisable to provide a spark plug with mea-ns for forming an external spark ga so that the sparking capacities of the e ectrodes can bedetermined without removing the lug and iii order that this may be convenient y done, I provide the 'yoke 10 with oppositely projecting wings 25, each having an opening therein for t e reception of an insulating tube 26 through which passes a stem 27. To the outer end of this stem is secured the notched terminal 29 'of one of the-conductors and to the inner end 4o the stem is secured a finger 30 notched for the'rece tion of the projecting ortion of one o? the terminals 13 or '14 othe plug, said notched fin er iittin between the confining nut 22 an the bin i nut. 24,'and, when the latter is loosened, being free to be swung sidewise so 'es to projecting produce a spark as soon as a an opening therein and the upper section gap is formed,60

as shown at the right, in Fig. 4.l

having an opening inclined in respect to that in the lowermemben'and an electrode passing through said openings and bent in the chamber A(between Vthe two sections of the insulating member.

3. A spark plugcontainng a socket, an insulating membercom'posed of upper and .lower sections in said socket, the lo'wer section having an opening therein and the upper section having an opening inclined in respect to that in the lower member, and flared as to its inner portion, and an electrode passing through the openings-in the two sectionsof the insulating member, and having 4upper and lower engagement'therewith so as to retain the sections in proper l relation to one another when the insulating member is removed from the plug.

4. A spark plug havingV an insulating member withprojecting electrode, a device for holding t-he said insulating member to the plug, and a finger liavinglan insulating pivotal mounting upon said oldingdevice which permits of swinging movementI of the vlinger in order to form a'spai'k gap on the outside of the plug. Q

.5. A spark plug having an insulating member with" electrode stems having o utwardly projecting ends, a yoke for holding said insulating member tothe plug, and iingers one on each side of the yoke, saidfingers having insulating pivotal inountin s which permit swingi 0f movement of t ie fingers, whereby a spar gap can be formed on the outside of the plug between either of the electrodes and' its corresponding finger. In testimony whereof, I have signed my v Kim A. Bmw,-

HAMILTON. D. TURNER. 

